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논문 기본 정보

자료유형
학술저널
저자정보
Kajan, Zahra Dalili (Department of Maxillofacial Radiology, Faculty of Dentistry, Guilan University of Medical Sciences) Khademi, Jalil (Department of Orthodontics, Faculty of Dentistry, Guilan University of Medical Sciences) Alizadeh, Ahmad (Department of Radiology, Poursina Hospital, Guilan University of Medical Sciences) Hemmaty, Yasamin Babaei (Faculty of Dentistry, Guilan University of Medical Sciences) Roushan, Zahra Atrkar (Department of Biostatistics, Guilan University of Medical Sciences)
저널정보
대한영상치의학회 Imaging science in dentistry Imaging science in dentistry 제45권 제3호
발행연도
2015.1
수록면
159 - 168 (10page)

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Purpose: This study was performed to compare the metal artifacts from common metal orthodontic brackets in magnetic resonance imaging. Material and Methods: A dry mandible with 12 intact premolars was prepared, and was scanned ten times with various types of brackets: American, 3M, Dentaurum, and Masel orthodontic brackets were used, together with either stainless steel (SS) or nickel titanium (NiTi) wires. Subsequently, three different sequences of coronal and axial images were obtained: spin-echo $T_1$-weighted images, fast spin-echo $T_2$-weighted images, and fluid-attenuated inversion recovery images. In each sequence, the two sequential axial and coronal images with the largest signal-void area were selected. The largest diameters of the signal voids in the direction of the X-, Y-, and Z-axes were then measured twice. Finally, the mean linear values associated with different orthodontic brackets were analyzed using one-way analysis of variation, and the results were compared using the independent t-test to assess whether the use of SS or NiTi wires had a significant effect on the images. Results: Statistically significant differences were only observed along the Z-axis among the four different brands of orthodontic brackets with SS wires. A statistically significant difference was observed along all axes among the brackets with NiTi wires. A statistically significant difference was found only along the Z-axis between nickel-free and nickel-containing brackets. Conclusion: With respect to all axes, the 3M bracket was associated with smaller signal-void areas. Overall, the 3M and Dentaurum brackets with NiTi wires induced smaller artifacts along all axes than those with SS wires.

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